Indicator



'A.; F. FERRAND.

mmcATu-. APPLICATION FILED JUNE 16,-1920.

.Pawn-ved. Mar. 29, 1921.

A TTURll/E V8 y narran STATES ALFRED FELIX FERRAND, OF NEW BRUNSWICK, NEW JERSEY.

INDICATOR.

Specification of Letters Patent. Y Patented Mal'. 29, 1921.

Application filed June 16, 1920. Serial No. 389,415.

To all whom t may concer/n, Be it known that I, ALFRED F. FERRAND, a citizen of France, and a resident of New Brunswick,`in the county of Middlesex and State of New Jersey, have invented a new and Improved Indicator, of which the following is a full, clear, and exact description. This invention relates to indicators, and has particular reference to one which is used in ,connection with metal-working machinery, such as milling machines, boring machines, and the like, to facilitate the lining up of the work with respect to a tool-holding device, and to readily indicate during the lining-up process the degree of eccentricity of the work with respect to the tool holder. An object of the invention is to provide a device which may be readily attached to the usual rotating tool spindle in a metal-working machine and which, by contactingwlth the work which is mounted in a stationary chuck, will indicate the amount by which the work is olf center in the chuck with respect to the tool spindle. y L

Another object is to provide a device 1n which certain parts thereof are adapted to rotate around the work, contact at the same time therewith, and; produce an indication on a dial or other device, which indicating dial and its correlated parts are adapted to remainy stationary while the remaining portions of the device are rotating, thus enabling themachinist at all times to easily read the indications. c

A further object is to providea device whereby work to be treated, and which is mounted in yan adjustable chuck or work holder, can be readilylined up with the tool spindle of the machine byreference to a hole in they work which is to be rebored, or by reference to a boss on the work 'in which a hole is to be bored.

lthe work with which the above-mentioned arm is adaptedto Contact is off center, this eccentricity is adapted to cause a lateral movementof the arm and, through a Suitable systemkof levers, to produce movement in an indicator arm which 'is so connected with the rotating portion of the device as toproduce an indication whileremaining stationary. By so remaining stationary, this indicator provides simple means whereby the operator can readily perceive, during the process of centering the work, the degree by which the work is oli center.

The invention more in detail comprises a rotatable shaft carrying a projecting arm adapted to contact with the work. By this arm suitable linkage is connected to an inner reciprocable. rod within the rotating shaft, which rod is connected to a sliding collar on the. shaft, and by movement therein, produced through the medium of the abovementioned work-contact arm, a stationary indicator arm Vin sliding Ycontact with ythe collar is caused to move and indicate on a dial.

The invention more specificallycomprises the particular arrangement and construction of the parts which will hereinafter be set forth more in detail in the following specification and claim.

The invention isillustrated in the drawing, of which- Figure' 1 represents an elevation of the device;

Fig. 2 representsa partial, longitudinal section through the main shaft; Fig. 3 represents a side elevation lower portion of the device; f

Fig- 4 represents a sectional view takenon the line 1 -1 of Fig. 1; and p Fig. 5 represents a sectional view taken on the line 5 5 of Fig. 1.

of the As shown in the drawing, the device which embodies my invention comprises a shaft or shank 1 which is adapted to be inserted in the spindle of a boring or drilling or other similar machine.- If `the spinfV member 4 which has collar portions 5 and 6 loosely embracing the shaft 1. At one end of the shaft 1 there is provided a fixed collar 7 to which is attached a curvedcrosspiece 8. To one end of the crosspiece 8 a bell crank lever 9 is pivoted.

The shank 1 is provided'iwith an inner bore 10 within which a rod 11 is adapted to have a certain limited movement. One end of this rod 11 is pinned to a collar 12 `which is adaptedA to have a slight `amount of sliding movementialong the shank 1. A pin 13 extends into and is adapted to move in a slot 14 in the shank 1. The other end of the rod 11 is reduced in diameter, andrat its outer end is provided with Va head nut 15 and a sliding collar 16 between which is located a spring 17. .Above the sliding collar 16 the reduced portion of the rod 11 is embraced by one end 18 of the bell crank lever 9.

The ,other end of the crosspiece 8 is in the form .of Va yoke, the portions 19 and 20 of which provide bearings fora shaft21 on which is looselymountedran arm 22. An outer end .of the shaft. 21 is threaded and is adapted `tobe loosely embraced by another arm 23 from a projectingportion 24 of which a spring 25 is adapted to extend. This spring 25 at its ,outer end is positioned between suitable pinsf26 and 27 on theyouter end of armi22. rThe position of the springholding `arm 23 `with respect to the shaft 21 is adj-usted by means of a thumb -screw nut 28, which can `be tightened against the face of arm 23 to hold itin any 'desired angular position with respect to shaft 21 and thereby determine theupressure of the spring 25 on the arm 22. This arm 221at its outer end is provided with a contact ball 29 `which Atis adapted to contact withfportions of the work, which is shown in dotted lines and represented by lthe letter A.

At the other end of the bell crank lever 9, a lever30is pivoted, which, at its outer end is provided with a slot 31. A threaded pin 32,. extending `from .the arm `22 lthrough the slot 31, has on its outer end a thumb nut33 which may `be i. tightened thereon' to fix the position'of the arm22 with respect to the slot 31.

The collar 12..is provided with a shoul der 34 against which a projectingwiinger 35, at one end of a pivoted lever 36, is adapted to bear. This lever 36 is pivotally mounted ona stationary bar 39 one endA of which is adapted to be inserted in a slot in the yoke 4 andto be fastened in said slot by means of `ascrew 4bolt 40 having a thumb nut 41. The lever 36 is provided with a pin 37 against which a spring 38, on the bar portion The work havingvbeen fastened in the adjustable chuck or work holder of-tl1emachine, the thumb nut 33 and the thumb nut .ilvis fastened in the spindle` of the machine. A

28 are both loosened. The arm 22 is moved in the slot 31 until the ball 29 contacts with part of the work, such as theouter surface `of ay circular castingor-thelinner surface of an aperture to be rebored, whereupon the thumb nut 33 is tightened to x the arm 22 with respect to the slot 31.. The bell crank lever 9 is, .during this ladjustment held so that the end of lever'36 is on the mid-point of dial 42. The arm'23 is then moved into such position as will .produce the desired tension in the spring 25 to keep the Iball 29 bearingagainst thework. The thumb nut 28 is thenftightened toffx the arm 23 in this position.

`The' spindlefholding `the shank lis now rotated, and as the ball 29 moves around in contact with the work surface, any eccentricity of said surface with .respect to the axis ofthe spindle results in a movement of the ball` 29 to or away from said axis. This movement is transmitted to `arm 22, toV lever 30, through bell crank lever 9, to= rod 11, to collar 12, and thence to the `lever 36 through the finger 35, giving on-thedial42 an indication of the amount4 by which the `workpiece-is off center.` After `the first indication, the workpiece may be readjusted and another indication. read, until the workpiece is finally centered.` y

This tool: being automatic` in` its action except-fon the initial adjustment of the .tool in the machine, in combination with the fact that theiindicating portion of the device remains stationary `during the `entire action,

ca'te eccentricity of work. in the holder or chuck, which indication can be read easily and conveniently anytimeand at all times during the operation of the device.

Whilel have indicated the'several types of machines and work` with which this tool is adapted to be used,.it can` be readily appreciated lthat many othertypes of work and machines are of such a nature as to permit of 120 providesa` simple, efficient means to indithe use of this tool Without necessitating any essential change in the tool which would depart from the spirit of my invention.

What I claim is:

A device for alining a workpiece with respect to an axis, Which comprises a rotatable shaft having an inner bore alined coincident with the axis, a projecting arm on said shaft, resilient means connected to said arm to maintain it in contact With the surface of a workpiece, a pivoted lever having a slot therein, said arm being adjustable in said slot, a reciprocable rod Within the bore of the shaft, operative connections between said lever and said rod, a collar on said shaft 15 said shoulder, and an indicating dial ar- 20 ranged adjacent the end of said lever.

ALFRED FELIX FERRAND. 

